bugfix for SIMPLE_WRITE_SOUND

[picodrive.git] / platform / win32 / GenaDrive / Unzip.cpp

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\r
#include "app.h"\r
#include "Unzip.h"\r
#include "zlib.h"\r
\r
// Decompress a 'deflate' compressed buffer\r
static int Inflate(unsigned char *dest,int destLen, unsigned char *src,int srcLen)\r
{\r
  z_stream stream;\r
\r
  memset(&stream,0,sizeof(stream));\r
\r
  stream.next_in  =src;\r
  stream.avail_in =srcLen;\r
  stream.next_out =dest;\r
  stream.avail_out=destLen;\r
  inflateInit2(&stream,-15);\r
  inflate(&stream,Z_FINISH);\r
  inflateEnd(&stream);\r
\r
  return 0;\r
}\r
\r
static int Get32(unsigned char *src)\r
{\r
  return src[0] | (src[1]<<8) | (src[2]<<16) | (src[3]<<24);\r
}\r
\r
// --------------------------------------------------------------\r
Unzip::Unzip()\r
{\r
  memset(this,0,sizeof(*this));\r
}\r
\r
int Unzip::gotoFirstFile()\r
{\r
  headerPos=0;\r
  return 0;\r
}\r
\r
int Unzip::fileOpen()\r
{\r
  int ret=0,okay=0;\r
\r
  fseek(file,headerPos,SEEK_SET);\r
\r
  // Read in file entry header:\r
  ret=fread(head,1,sizeof(head),file);\r
  if (ret!=sizeof(head)) return 1;\r
\r
  // Check header:\r
  if (head[0]=='P' && head[1]=='K' && head[2]==3 && head[3]==4) okay=1;\r
  if (okay==0) return 1;\r
\r
  // Get compressed and uncompressed sizes:\r
  srcLen =Get32(head+0x12);\r
  dataLen=Get32(head+0x16);\r
\r
  // Get size of name and extra fields:\r
  nameLen=Get32(head+0x1a);\r
  extraLen=nameLen>>16; nameLen&=0xffff;\r
\r
  // Read in name:\r
  name=(char *)malloc(nameLen+1); if (name==NULL) return 1;\r
  memset(name,0,nameLen+1);\r
  fread(name,1,nameLen,file);\r
\r
  // Find position of compressed data in the file\r
  compPos=headerPos+sizeof(head);\r
  compPos+=nameLen+extraLen;\r
\r
  return 0;\r
}\r
\r
int Unzip::fileClose()\r
{\r
  free(name); name=NULL;\r
\r
  // Go to next header:\r
  headerPos=compPos+srcLen;\r
\r
  srcLen=dataLen=0;\r
  nameLen=extraLen=0;\r
\r
  return 0;\r
}\r
\r
int Unzip::fileDecode(unsigned char *data)\r
{\r
  unsigned char *src=NULL;\r
\r
  // Go to compressed data:\r
  fseek(file,compPos,SEEK_SET);\r
\r
  // Allocate memory:\r
  src=(unsigned char *)malloc(srcLen);\r
  if (src==NULL) { fclose(file); return 1; }\r
  memset(src,0,srcLen);\r
\r
  // Read in compressed version and decompress\r
  fread(src,1,srcLen,file);\r
\r
  Inflate(data,dataLen, src,srcLen);\r
\r
  free(src); src=NULL; srcLen=0;\r
\r
  return 0;\r
}\r